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Automating Manufacturing Systems - Process Control and ...

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plc timers - 9.24<br />

Solution:<br />

Go<br />

Stop<br />

Light<br />

Light<br />

Part Detect<br />

TON<br />

Preset 1.5s<br />

incoming<br />

incoming.DN<br />

TON<br />

Preset 2s<br />

stopped<br />

incoming.DN<br />

Light<br />

Motor<br />

stopped.DN<br />

stopped.DN<br />

incoming<br />

RES<br />

stopped<br />

RES<br />

Consider: What is assumed about part arrival <strong>and</strong> departure?<br />

Figure 9.24<br />

A Conveyor <strong>Control</strong>ler Example<br />

9.7.5 Accept/Reject Sorting<br />

Problem: For the conveyor in the last case we will add a sorting system. Gages<br />

have been attached that indicate good or bad. If the part is good, it continues on. If the part<br />

is bad, we do not want to delay for 2 seconds, but instead actuate a pneumatic cylinder.<br />

www.PA<strong>Control</strong>.com

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